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公开(公告)号：US2628090A
公开(公告)日：1953-02-10
申请号：US9972049
申请日：1949-06-17
Applicant: JAMES VERDIER WILLIS
Inventor： JAMES VERDIER WILLIS
IPC: E05F15/16
CPC classification number: E05F15/686 , E05Y2201/434 , E05Y2201/604 , E05Y2201/642 , E05Y2201/708 , E05Y2600/46 , E05Y2900/106
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